Utevsky S.Y., Sokolov S.G., Shedko M.B.
В журнале Systematic Parasitology
Год: 2013 Том: 84 Номер: 1 Страницы: 71-79
Acanthobdellidans are unique in their organization and phylogenetic relationships due to having transitional characters that combine features of oligochaetous and achaetous annelids. Alongside with relatively well-studied Acanthobdella peledina, there is another member of the group, Paracanthobdella livanowi, with five rows of chaetae and the anterior sucker. It appears that the anterior sucker is weakly developed in small juveniles but gains a deep cavity in adults. Smaller individuals of P. livanowi can be distinguished from A. peledina, which does not possess the anterior sucker, by the varying breadth of their chaetae. The mid-body segment consists of two doubled annuli in juveniles and is four-annulate in large individuals. In Kamchatka fresh waters, hosts of P. livanowi include mostly some species of the genus Salvelinus and more rarely Gasterosteus aculeatus, Oncorhynchus mykiss and Oncorhynchus kisutch. New information on the distribution and the biology of P. livanowi is presented.
